Best Upgrades: What to Upgrade First

As you progress in The Callisto Protocol, you will need to upgrade the proper items for an easier combat experience. Read on to learn the best upgrades and what weapons to upgrade first..

The Callisto Protocol Weapon Guides
All Weapons	Best Upgrades	Best Weapons

What to Upgrade First

Jump to a Section
Prioritize Riot Control Swing on the Stun Baton Purchase Small GRP Upgrades Max Out the BI-55 Pistol Avoid Purchasing Consumables

Prioritize Riot Control Swing on the Stun Baton

Weapon Upgrade	Pre-Requisite	Credits Effect
Riot Control Swing	None	300 Credits Unlocks a new, heavier attack. Ideal for extreme situations requiring damage over control.

Despite being one of the earlier weapons you find, the Stun Baton is a reliable weapon that can help you all throughout the game. The Riot Control Swing upgrade extends your attack range to enemies that are further from you and deals more damage than your regular melee hits. This attack is essential as you won't have much firepower early on.

Take Damage Upgrade Level 2 for Late Game

Weapon Upgrade	Pre-Requisite	Credits Effect
Damage Upgrade Level 2	Damage Upgrade Level 2	2700 Credits Maxes out the damage of the Stun Baton.

As you reach the later stages of the game, you'll find that firearms are the better primary weapon when it comes to fighting off enemies. However, it would still be good to upgrade the Stun Baton in case you run out of ammo. Upgrading to Damage Upgrade Level 2 lets you maximize the power of each melee hit and wears down enemies quicker.

Purchase Small GRP Upgrades

During the Aftermath story chapter, Jacob will need to head to the Medical Bay at which point you will find and equip the GRP. Once you have both the GRP and Stun Baton, fending off enemies without expending ammo will be much easier.

Weapon Upgrade	Pre-Requisite	Credits Effect
GRP Recharge Speed Upgrade - Small	None	300 Credits Increases the GRP's recharge rate.
Energy Upgrade - Small	None	300 Credits Increases the GRP's max energy capacity.
GRP Velocity Upgrade - Small	None	300 Credits Increases the GRP's launch strength. Targets can be injured on impact.

You'll want to purchase all Small upgrades for the GRP prioritizing Energy Upgrade - Small as this increases the GRP's max energy capacity.

GRP (Gravity Restraint Projector) Upgrades and How to Get

Prioritize Energy Capacity Upgrades

Weapon Upgrade	Pre-Requisite	Credits Effect
Energy Upgrade - Max	Energy Upgrade - Medium	2700 Credits Maxes out the GRP's energy capacity.

The GRP's Energy Capacity can feel very insufficient even for players that don't use this weapon much when fighting enemies. For that reason you want to purchase Energy Upgrade - Max to get more efficient utility with the GRP.

Max Out the Hand Cannon

The BI-55 Pistol "Hand Cannon" can be acquired by printing it from the Reforge Station at the start of Aftermath. As you won't have a lot of space in your inventory early on, purchasing the High Capacity Magazine Upgrade can prove very beneficial since it provides extra ammo.

Weapon Upgrade	Pre-Requisite	Credits Effect
Stability Upgrade	None	200 Credits Reduces weapon recoil.
High Capacity Magazine Upgrade	Stability Upgrade	200 Credits Increases ammo capacity of the BI-55 Pistol.

Once you have more Callisto Credits, you can purchase the last 2 upgrades for the "Hand Cannon". This weapon might feel underwhelming toward the later stages of the game at which point you can move on and max out whichever weapon feels best for your playstyle.

BI-55 Pistol “Hand Cannon” Upgrades and How to Get

Upgrade to Explosive Rounds Later On

Despite being the first firearm you get in the game, the Hand Cannon holds up very well in from the early-mid game and can also be a decent alternative weapon in the late game. The TK23 Boom Bullets inflict decent damage thanks to the previous Magnum Rounds Damage Upgrade combined with the explosive rounds.

Avoid Purchasing Consumables

Consumables such as ammo and Health Injectors can be purchased alongside these upgrades but we advise against this unless you really need them. These items can be found in various places such as chests, lockers or by stomping on corpses so acquiring them this way and saving your Credits for Upgrades is the best course of action.

Best Weapon Upgrades

Jump to a Section
Hand Cannon	Skunk Gun	Riot Gun
Tactical Pistol	Assault Rifle

Hand Cannon

As mentioned above, upgrading to the TK23 Boom Bullets as the explosive rounds can help you against more durable enemies. This upgrade is also the easiest/quickest way to unlock the You Need a Gun trophy.

Weapon Upgrade	Pre-Requisite	Credits Effect
TK23 "Boom Bullets"	Magnum Rounds Damage Upgrade	1800 Credits Adds alt-fire module that fires explosive rounds. Rounds explode on a delay after impact.

Skunk Gun

Upgrading the Skunk Gun is particularly useful for combining with your melee attacks. Upgrade to the Swarming Rounds for a more lethal combo and finish off enemies in a quicker fashion.

Weapon Upgrade	Pre-Requisite	Credits Effect
Swarming Rounds	Stability Upgrade	3600 Credits Modifies this weapon to fire homing ammo that swarms nearby enemies.

Riot Gun

The final upgrade to the Riot Gun is Explosive Rounds Upgrade and as the name suggests, shoots out ammo that explode shortly after impact. This is particularly useful when facing groups of enemies as the explosion deals damage in a radius.

Weapon Upgrade	Pre-Requisite	Credits Effect
Explosive Rounds Upgrade	High Capacity Magazine Upgrade	2700 Credits Upgrades the Riot Gun's projectiles, which explode shortly after impact. Deals extra damage to anything within the blast radius.

Tactical Pistol

The Tac Pistol is a great weapon for getting quick shots off thanks to its quick fire rate but upgrading to the TK33 Burst Mode equips the weapon with a high-damage burst attack.

Weapon Upgrade	Pre-Requisite	Credits Effect
TK33 "Burst Mode"	High Capacity Magazine Upgrade	3600 Credits Adds alt-fire module with high-damage 5 round burst.

Assault Rifle

Once you purchase the Assault Rifle, you can get away with only upgrading it to Magnum Rounds Damage Upgrade as the added damage can go a long way when fighting mutated biophages.

The Assault Rifle has one of the more expensive upgrade paths and while upgrading it all the way to TK63 Homing Rounds can make the weapon stronger, it would be better to use those upgrades for other equipment such as the GRP or the previously mentioned guns.

Weapon Upgrade	Pre-Requisite	Credits Effect
Magnum Rounds Damage Upgrade	High Capacity Magazine Upgrade	1500 Credits Increases the damage of the Assault Rifle.

How to Upgrade Weapons

Use Callisto Credits at the Reforge

Players can upgrade weapons and other items by purchasing them at the Reforge with Callisto Credits. If a player has insufficient credits, items like Energy Converter or Contraband Pack can be sold for Callisto Credits.

How to Farm Callisto Credits

The Callisto Protocol Related Guides

Tips and Tricks:
Beginner's Guide to The Callisto Protocol

All Tips & Tricks

Skins and Cosmetics
List of Skins	How to Get the Biophage Skin
How to Get the Retro Prisoner Skin	How to Get the Founder's Pack
How to Get the Engineer Skin	How to Get Watchtower Skin
How to Get Outer Way Skin	-
Game Mechanics & Upgrades
All Reforge Weapon Upgrades	Inventory Upgrade Guide
How to Get Armor	How to Heal
How to Farm Callisto Credits	Ammo Farming Guide
How to Perform a Quick Kill	-
Weapons & Combat
Best Upgrades Guide	Gun Controls Guide
How to Dodge Melee Attacks	How to Block
Best Weapons Guide	Perfect Dodge Guide
System / FAQs
Difficulty Settings Guide	Best Settings Guide
New Game Plus Guide	Season Pass Price and Contents
All Permanent Events and Missable Content	List of All Death Animations/Scenes
How to Fix Stuttering and Frame Rate Issues	Can You Save the Trapped Worker?
How to Pre-Load	How to Fix Low Quality Text
How to Use Photo Mode	Is There a Map?
How to Reset Checkpoints	Contagion Mode Guide
How to Save: Can You Turn Off Autosave?	What are Beta Paths?
All Weapon Schematic Locations	Ending Explained
Can You Quick Turn?	Can You Skip Cutscenes?
List of Unlockables	-